JSON.NET 序列化问题

使用JSON.NET进行数据序列化是一种常见的操作，它可以将对象转换为JSON格式的字符串，以便在不同的系统之间进行数据传输和存储。然而，有时候在使用JSON.NET进行序列化时会遇到一些问题，本文将介绍一些常见的序列化问题以及解决方法。

csharp
public class Person
{
    public string Name { get; set; }
    public Person Friend { get; set; }
}
var john = new Person { Name = "John" };
var alice = new Person { Name = "Alice" };
john.Friend = alice;
alice.Friend = john;
var json = JsonConvert.SerializeObject(john);

csharp
[JsonObject(MemberSerialization.OptIn)]
public class Person
{
    [JsonProperty]
    public string Name { get; set; }
    [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
    public string Address { get; set; }
}
var john = new Person { Name = "John", Address = null };
var json = JsonConvert.SerializeObject(john);

csharp
var date = new DateTime(2022, 1, 1);
var json = JsonConvert.SerializeObject(date, new JsonSerializerSettings
{
    DateFormatString = "yyyy-MM-dd"
});

csharp
[StringEnum]
public enum Gender
{
    Male,
    Female
}
public class Person
{
    public string Name { get; set; }
    public Gender Gender { get; set; }
}
var john = new Person { Name = "John", Gender = Gender.Male };
var json = JsonConvert.SerializeObject(john);